TUBE COLLIMATORS

Optical Surfaces Ltd. has released tube-mounted off-axis collimators that eliminate the precise alignment usually required by such mirrors. Each collimator comprises an aluminum tube with matte black internal walls and uses zero-expansion glass ceramic optics for stability over a wide temperature range. The optics are prealigned in stress-free mounts, and the combined optical performance is better than λ/5 pv at 633 nm in the field center. All optics are coated with Al and MgF2 for achromatic performance at any wavelength.